/*
 * Copyright 2007 David R Kirkland 
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");  
 * you may not use this file except in compliance with the License. 
 * You may obtain a copy of the License at 
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0 
 * 
 * Unless required by applicable law or agreed to in writing, software 
 * distributed under the License is distributed on an "AS IS" BASIS, 
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 * See the License for the specific language governing permissions and 
 * limitations under the License.
 */

using System;
using System.Collections.Generic;
using System.Text;

namespace NetSpider.Retrieval.Policies
{
    /// <summary>
    /// A set of comparison operators.
    /// </summary>
    public abstract class Comparison : IComparison
    {
        public static readonly Comparison GreaterThan = new GreaterThanComparison();
        public static readonly Comparison LessThan = new LessThanComparison();
        public static readonly Comparison EqualTo = new EqualToComparison();

        private class LessThanComparison : Comparison
        {
            public override bool Check(int value, int compareTo)
            {
                return value < compareTo;
            }
        }

        private class GreaterThanComparison : Comparison
        {
            public override bool Check(int value, int compareTo)
            {
                return value > compareTo;
            }
        }

        private class EqualToComparison : Comparison
        {
            public override bool Check(int value, int compareTo)
            {
                return value == compareTo;
            }
        }

        public abstract bool Check(int value, int compareTo);
    }

    public interface IComparison
    {
        bool Check(int value, int compareTo);
    }
}
